What are some good performance upgrades?

forums.vptuning.com
volvospeed.com
forums.swedespeed.com
volvomotorsports.com
The offer a 300hp N/A race motor

Answered I believe

http://www.ipdusa.com
http://www.eurosportperformance.com
http://www.horsepowerfreaks.com

Those are suplier's to volvo performance. Volvospeed is a good board, I've been active over there also. Also you need to be more specific, what kind of 850?

854 = Sedan 855= wagon turbo or not? GLT, 850R (T5-R), T5 or just standard.

you looking for go fast parts or handling?